VisualFirewall/IDS is a research-grade Firewall and IDS visualization tool that aims to provide a highly-informative interface of network activities that relate to system security. The program is designed with novice system security administrators in mind who need easy to learn representations of security information, but also need the power of forensic analysis on past attacks.
I just found out about Logstalgia on October 5, 2014, and it has been around since at least 2010. But WOW! they've put in some beautiful graphics to essentially the same concept. Logstalgia operates on webserver logs.
Christopher P. Lee, Jason Trost, Nicholas Gibbs, Raheem Beyah, John A. Copeland, "VisualFirewall: A Firewall Visualization Tool for Network Management and Security Analysis", VizSEC 2005, October 2005.
